DataView.prototype.setUint8()

The setUint8() method of {{jsxref("DataView")}} instances takes a number and stores it as an 8-bit unsigned integer in the byte at the specified byte offset of this DataView.

{{InteractiveExample("JavaScript Demo: DataView.prototype.setUint8()")}}

```js interactive-example // Create an ArrayBuffer with a size in bytes const buffer = new ArrayBuffer(16);

const view = new DataView(buffer); view.setUint8(1, 255); // Max unsigned 8-bit integer

console.log(view.getUint8(1)); // Expected output: 255

## Syntax

```js-nolint
setUint8(byteOffset, value)

Parameters#

• byteOffset
• : The offset, in bytes, from the start of the view to store the data in.
• value
• : The value to set. For how the value is encoded in bytes, see Value encoding and normalization.

Return value#

{{jsxref("undefined")}}.

Exceptions#

• {{jsxref("RangeError")}}
• : Thrown if the byteOffset is set such that it would store beyond the end of the view.

Examples#

Using setUint8()#

const buffer = new ArrayBuffer(10);
const dataview = new DataView(buffer);
dataview.setUint8(0, 3);
dataview.getUint8(0); // 3

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• JavaScript typed arrays guide
• {{jsxref("DataView")}}
• {{jsxref("ArrayBuffer")}}
• {{jsxref("Uint8Array")}}